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Simplifying 7x + 4 + 5x + 8 + 4x + -8 = 90 Reorder the terms: 4 + 8 + -8 + 7x + 5x + 4x = 90 Combine like terms: 4 + 8 = 12 12 + -8 + 7x + 5x + 4x = 90 Combine like terms: 12 + -8 = 4 4 + 7x + 5x + 4x = 90 Combine like terms: 7x + 5x = 12x 4 + 12x + 4x = 90 Combine like terms: 12x + 4x = 16x 4 + 16x = 90 Solving 4 + 16x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 16x = 90 + -4 Combine like terms: 4 + -4 = 0 0 + 16x = 90 + -4 16x = 90 + -4 Combine like terms: 90 + -4 = 86 16x = 86 Divide each side by '16'. x = 5.375 Simplifying x = 5.375
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